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2*x-(3*y) = 1/2 // - 1/2
2*x-(3*y)-(1/2) = 0
2*x-3*y-1/2 = 0
2*x-3*y-1/2 = 0 // + -3*y-1/2
2*x = -(-3*y-1/2) // : 2
x = (-(-3*y-1/2))/2
x = (1/2-(-3*y))/2
x = (1/2-(-3*y))/2
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